Our weekly trip through San Diego history features a 113-year anniversary for San Diego's legal community and a nine-year anniversary for the Chargers' top employee. Plus your chance to win a book in the U-T San Diego trivia contest.

April 23: In 1891, Benjamin Harrison became the first incumbent U.S. president to visit San Diego. He ate at the Hotel del Coronado, three years after it was built. That was so long ago, Kate Morgan wasn't even a ghost yet.

April 24: In 1949, San Diego converted to an all bus transit system after an electric streetcar made one final run. Car #446 and its driver, N.A. Holmquist, retired at the same time, 5:35 a.m.

April 25: In 2001, Padres oufielder Rickey Henderson led off the ninth inning at Qualcomm Stadium with a major league-record 2,063rd walk. He blew kisses to the crowd from first base then held the record for three years until Barry Bonds became the all-time walks leader.

April 26: In 1985, La Jolla High School teacher Gloria McMillan was named one of California's two finalists in NASA's "Teacher in Space" program. New Hampshire's Christa McAuliffe was fatefully chosen for that distinction over McMillan and thousands of others.

April 27: In 1988, Olaf Wieghorst, a painter who was born in Denmark and settled in El Cajon, died at 88. His canvasses captured the grandeur of the American West. Locally, the Wieghorst Western Heritage Center keeps his memory alive.

April 28: In 1927, Charles Lindbergh tested the Spirit of St. Louis, which was built by the Ryan Aircraft Company in San Diego.

Our weekly giveaway

Email or tweet me answers to the trivia question by 5 p.m. Tuesday to enter a random drawing to win a nonfiction book from the U-T library.

A helpful hint: You don't have to scour the Internet for the answer. You'll find it via a link on this page.